These are illnesses caused by infestation (infection) with parasites such as protozoa (one-celled animals), worms, or insects.
Endoparasite: An organism that lives inside its host. It’s like having someone living rent-free inside your home!
Ectoparasite: An organism that lives on the surface of its host. Like having someone constantly hanging onto you but not actually being part of you.
Helminths: These are worm-like parasites living in and feeding on living hosts, receiving nourishment and protection while disrupting their hosts' nutrient absorption.
AP Human Geography - 2.5 The Demographic Transition Model
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